a soccer player kicks a ball with an initial velocity of 10 meters per second at an angle of 30 degrees

Did you make a diagram?

Make your hypotenuse 10 and the base angle 30°

find the length of the adjacent side using

10cos30°

Explanation:

A soccer player kicks a ball with an initial velocity of 10.0 meters per second at an angle of 30.0° above the horizontal. The magnitude of the horizontal component ofthe ball's initial velocity is which of the following?

9.8 m/s

0.50 m/s

15 m/s

7.4 m/s

Explanation:

no. dot product   =0 when vecs at right angles

see earlier answer